<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
   
    <script src="../assets/css/test.less" type="text/css"></script>
    <style>
       
        .box2{
            width: 100px;
            height: 100px;
            background: blue;
        }
        .box3{
            width: 50px;
            height: 50px;
            background: grey;
        }
    </style>
</head>
<body>
    <div class="box1">
        <div class="box2">
            <div class="box3">
        
            </div>
        </div>
    </div>
</body>
</html>